Description

The PCM514x devices are a family of monolithic CMOS integrated circuits that include a stereo digital-to-analog converter and additional support circuitry in a small TSSOP package. The PCM514x uses the latest generation of TIs advanced segment-DAC architecture to achieve excellent dynamic performance and improved tolerance to clock jitter.

Members of the PCM514x family integrate a fully programmable miniDSP core, allowing developers to integrate filters, dynamic range controls, custom interpolators and other differentiating features to their products.

The PCM514x provides 2.1VRMS ground centered outputs, allowing designers to eliminate DC blocking capacitors on the output, as well as external muting circuits traditionally associated with single supply line drivers.

The integrated line driver surpasses all other charge-pump based line drivers by supporting loads down to 1kΩ. By supporting loads down to 1kΩ, the PCM514x can essentially drive up to 10 products in parallel, such as LCD TV, DVDR, AV Receivers.

The integrated PLL on the device removes the requirement for a system clock (commonly known as master clock), allowing a 3-wire I2S connection and reducing system EMI.

In addition, the PLL is completely programmable, allowing the device to become the I2S clock master and drive a DSP serial port as a slave. The PLL also accepts a non-standard clock (up to 50MHz) as a source to generate the audio related clock (for example 24.576MHz).

Intelligent clock error and PowerSense undervoltage protection utilizes a two level mute system for pop-free performance. Upon clock error or system power failure, the device digitally attenuates the data (or last known good data), then mutes the analog circuit.

Compared with existing DAC technology, the PCM514x family offers up to 20dB lower out-of-band noise, reducing EMI and aliasing in downstream amplifiers/ADCs. (from traditional 100kHz OBN measurements all the way to 3MHz).

The PCM514x accepts industry-standard audio data formats with 16- to 32-bit data. Sample rates up to 384kHz are supported.

Features

Programmable miniDSP

Market-Leading Low Out-of-Band Noise

Selectable Digital-Filter Latency and Performance

No DC Blocking Capacitors Required

Integrated Negative Charge Pump

Internal Pop-Free Control For Sample-Rate Changes Or Clock Halts

Intelligent Muting System; Soft Up or Down Ramp and Analog Mute For 120dB Mute SNR With Popless Operation